CN113200688A - Method for preparing cementing material based on comprehensive tailings - Google Patents
Method for preparing cementing material based on comprehensive tailings Download PDFInfo
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- CN113200688A CN113200688A CN202110402980.8A CN202110402980A CN113200688A CN 113200688 A CN113200688 A CN 113200688A CN 202110402980 A CN202110402980 A CN 202110402980A CN 113200688 A CN113200688 A CN 113200688A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/424—Oxides, Hydroxides
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/425—Acids or salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
- C04B7/42—Active ingredients added before, or during, the burning process
- C04B7/421—Inorganic materials
- C04B7/427—Silicates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention belongs to the technical field of solid waste resource utilization, and discloses a method for preparing a cementing material based on comprehensive tailings. The prepared cementing material has high durability, strong weather resistance, strong corrosion resistance, early strength, rapid hardening, high anti-permeability grade, wind erosion resistance and freeze thawing resistance.
Description
Technical Field
The invention belongs to the technical field of solid waste resource utilization, and particularly relates to a method for preparing a cementing material based on comprehensive tailings.
Background
With the development of economy, the increasing amount of industrial waste has caused many social and environmental problems. It not only causes serious environmental pollution but also directly affects the social stability and economic development. In recent years, the solid waste is gradually applied to the cement industry, so that the aims of energy conservation and emission reduction can be achieved, and the problem of environmental pollution caused by the solid waste can be solved. The cement industry is developing towards the direction of greenization, and at present, green, healthy, intelligence become the key direction that leads to scientific and technological innovation, must rely on scientific and technological innovation, carries out technical transformation to traditional industry, improves resource and energy availability factor, develops novel green material. In the "industrial structure adjustment guidance catalog of national development committee (2019)", new regulations are made on the industrial structure adjustment of the building material industry, and the application of new technologies of environmental protection, green and energy conservation is encouraged. The process technology for producing the high-performance tailing-based cementing material by adopting the novel ultra-micro powder technology is a transformation of the traditional cement industry, meets the requirement of the development of the circular economy industry, solves the problems of the exhaustion of current resources and environmental pollution, and solves the following problems in the recycling of tailings:
1. the raw materials used in the production of the new technology use a large amount of tailings, waste residues and other wastes. Tailings are mainly used as main components, and the tailing parameters reach over 50 percent.
2. The production process is favorable for protecting the environment and does not produce secondary pollution. The production process has no calcination, all uses electric energy, reduces energy consumption and has no tail gas emission; the production process has no dust, the production process adopts an international advanced process, and the full-closed production line is used for automatic production.
3. Saving resources and protecting environment. The novel superfine powder technology fully utilizes waste, tailings do not need to be reclassified, and the resource utilization efficiency is improved; the discharge of toxic and harmful substances in the waste is reduced, various toxic and harmful wastes can be simultaneously absorbed, and the discharge of the three wastes is nearly zero.
The green environment-friendly cementing material prepared by the novel ultramicro powder technology has the outstanding advantages of high strength, corrosion resistance, permeability resistance, high durability, long service life and the like, and must obtain good economic benefit in project construction application. The method solves a plurality of problems which are urgently to be solved and restrict the infrastructure and national defense construction in China, and has a cross-over significance for improving the engineering construction quality, prolonging the service life of the infrastructure, shortening the construction period, reducing the subsequent maintenance frequency and saving the construction and maintenance cost.
Traditional cement production produces acceptable raw meal and calcines acceptable clinker by consuming large amounts of non-renewable resources and energy. The high-performance tailing-based cementing material is used as a building material, can not only consume a large amount of tailing wastes, but also accord with the national economic development direction of energy conservation, emission reduction and consumption reduction, and has important significance for the reasonable utilization of resources and the sustainable development of the cement industry in China.
Under the background of domestic and foreign economic environments, China mainly develops large capital construction projects, and the space demand of the cement market is huge. The novel ultra-micro powder technology for treating the comprehensive tailings is good in future growth in the cement industry market, and the market space is very wide.
The traditional cement production process is basically that the production process of 'two-grinding and one-burning' is adopted, clinker, gypsum and mixed materials are measured, and then are directly fed into a ball mill for grinding through a conveying device, and then are separated through a powder separator and enter a finished product warehouse. Practice proves that the traditional cement industry development mode characterized by large consumption of resources and environmental pollution is difficult to adapt to the development of the times, and a green and environment-friendly cement industry mode with resource conservation, no pollution, high quality benefit and scientific and technological leading type sustainable development is required to be replaced. Although the research on the production process of new dry cement, polymer composite material, high-strength synthetic material and other aspects is carried out at home and abroad, the performance of the material is basically enhanced by chemical reaction generated by burning, grinding and blending, adding organic material and other methods, and the problems of resource waste, high energy consumption, indirect environmental pollution, material service life prolonging, material comprehensive performance improvement and the like cannot be fundamentally solved.
A process capable of really realizing clean production is urgently needed to change the development mode of the traditional cement.
Disclosure of Invention
The invention aims to overcome the production process of 'two-grinding and one-burning' in the prior art, and the ultra-micro powder technology is utilized to carry out particle recombination while crushing and separating the comprehensive tailings and the additives, so that mineral powder particles are recoated to generate a gelled material, high-temperature calcination and chemical reaction are not carried out in the whole process, and zero emission of solid waste is realized.
A method for preparing a cementing material based on comprehensive tailings comprises the following steps:
(1) primary crushing: primarily crushing tailings, spraying raw ore by using high-pressure water mist in feeding, and forming a large water curtain by using high-pressure water of a plurality of sections of water pumps to block dust leakage during primary crushing of the raw ore to obtain primary crushed ore;
(2) sorting: conveying the primary crushed ore into an intelligent automatic sorting machine for sorting;
(3) crushing in middle: respectively feeding the ores sorted out in the step (2) into a medium crusher for medium crushing to obtain medium crushed ores;
(4) grinding: feeding the crushed ore into a pulverizer to grind;
(5) grinding: carrying out two-side grading on the ore ground in the step (4) by an ultra-fine powder grader in sequence, and finally selecting the ultra-fine powder ore;
(6) preparing materials: mixing the ores of different grades sorted in the step (2) with additives in different proportions, grinding the additives, and mixing the ground additives with the ultrafine powder ores obtained in the step (5) to obtain a mixed base material;
(7) and (4) feeding the mixed base material obtained in the step (6) into an ultramicro powder all-in-one machine, crushing and sufficiently separating the mixed base material in the ultramicro powder all-in-one machine through high-speed airflow, and recoating the mineral powder particles to obtain the cementing material.
Further, the ores with different grades in the step (2) are comprehensive tailings taking the high-iron tailings and the copper tailings as main components.
Further, the additive A matched with the comprehensive tailings is prepared by compounding alkali metal silicate, alkali metal carbonate, fly ash and limestone powder.
Further, the additive A comprises the following components in parts by weight: 10-20% of alkali metal silicate, 10-20% of alkali metal carbonate, 40-60% of fly ash and 10-20% of limestone powder.
Further, the additive B matched with the comprehensive tailings is compounded by aluminum oxide, fly ash, sodium hydroxide or potassium hydroxide.
Further, the additive B comprises the following components in parts by weight: 10-15% of aluminum oxide, 75-80% of fly ash, 5-10% of sodium hydroxide or 5-10% of potassium hydroxide.
Further, the ratio of the comprehensive tailings to the additive A is 6-8: 1.
Furthermore, the ratio of the comprehensive tailings to the additive B is 7-9: 1.
Compared with the prior art, the invention has the beneficial effects that:
1. the ultrafine powder technology is utilized to carry out particle recombination while crushing and separating tailings and additives, so that mineral powder particles are recoated to generate a gelled material, high-temperature calcination and chemical reaction are not carried out in the whole process, and zero emission of solid waste is realized.
2. The prepared cementing material has high durability, strong weather resistance, strong corrosion resistance, early strength, rapid hardening, high anti-permeability grade, wind erosion resistance and freeze thawing resistance.
Detailed Description
Example 1
The invention relates to a method for preparing a cementing material based on comprehensive tailings, which comprises the following steps:
(1) primary crushing: primarily crushing tailings, spraying raw ore by using high-pressure water mist in feeding, and forming a large water curtain by using high-pressure water of a plurality of sections of water pumps to block dust leakage during primary crushing of the raw ore to obtain primary crushed ore;
(2) sorting: conveying the primary crushed ore into an intelligent automatic sorting machine for sorting; obtaining 28 percent of high-iron comprehensive tailings and 6 percent of copper comprehensive tailings
(3) Crushing in middle: respectively feeding the ores sorted out in the step (2) into a medium crusher for medium crushing to obtain medium crushed ores;
(4) grinding: feeding the crushed ore into a pulverizer to grind;
(5) grinding: carrying out two-side classification on the ore ground in the step (4) by an ultra-fine powder classifier, and finally selecting the ultra-fine powder ore;
(6) preparing materials:
mixing the 28% of high-iron comprehensive tailings sorted in the step (2) with an additive compounded by alkali metal silicate, alkali metal carbonate, fly ash and limestone powder according to the mass ratio of 6: 1, wherein the additive comprises the following components in parts by weight: grinding 20% of alkali metal silicate, 20% of alkali metal carbonate, 40% of fly ash and 20% of limestone powder, and mixing the additive with the superfine powder ore obtained in the step (5) to obtain a mixed base material of the comprehensive tailings;
mixing the 6% copper comprehensive tailings sorted in the step (2) with an additive compounded by aluminum oxide, fly ash and sodium hydroxide according to a mass ratio of 7: 1, wherein the additive comprises the following components in parts by weight: 15% of aluminum oxide, 75% of fly ash and 10% of sodium hydroxide, and the additive is ground and mixed with the ultra-fine powder ore obtained in the step (5) to obtain the copper comprehensive tailing mixed base material.
(7) And (4) respectively feeding the high-iron comprehensive tailing mixed base material and the copper comprehensive tailing mixed base material obtained in the step (6) into an ultra-fine powder all-in-one machine, sufficiently crushing and separating the mixed base material in the ultra-fine powder all-in-one machine through high-speed airflow, and re-coating the mineral powder particles to respectively obtain the cementing material.
Example 2
The invention relates to a method for preparing a cementing material based on comprehensive tailings, which comprises the following steps:
(1) primary crushing: primarily crushing tailings, spraying raw ore by using high-pressure water mist in feeding, and forming a large water curtain by using high-pressure water of a plurality of sections of water pumps to block dust leakage during primary crushing of the raw ore to obtain primary crushed ore;
(2) sorting: conveying the primary crushed ore into an intelligent automatic sorting machine for sorting; obtaining 16 percent of high-iron comprehensive tailings and 8 percent of copper comprehensive tailings
(3) Crushing in middle: respectively feeding the ores sorted out in the step (2) into a medium crusher for medium crushing to obtain medium crushed ores;
(4) grinding: feeding the crushed ore into a pulverizer to grind;
(5) grinding: carrying out two-side grading on the ore ground in the step (4) by an ultra-fine powder grader in sequence, and finally selecting the ultra-fine powder ore;
(6) preparing materials:
mixing 16% of high-iron comprehensive tailings sorted according to the step (2) with an additive compounded by alkali metal silicate, alkali metal carbonate, fly ash and limestone powder according to a mass ratio of 8: 1, wherein the additive comprises the following components in parts by weight: 10% of alkali metal silicate, 10% of alkali metal carbonate, 60% of fly ash and 20% of limestone powder, and grinding the additive to mix with the ultra-fine powder ore obtained in the step (5) to obtain a mixed base material of the high-iron comprehensive tailings;
mixing the 8% copper comprehensive tailings sorted according to the step (2) with an additive compounded by aluminum oxide, fly ash and sodium hydroxide according to a mass ratio of 9: 1, wherein the additive comprises the following components in parts by weight: and (3) grinding 10% of aluminum oxide, 80% of fly ash and 10% of potassium hydroxide, and mixing the additive with the ultra-fine powder ore obtained in the step (5) to obtain the copper comprehensive tailing mixed base material.
(8) And (4) respectively feeding the high-iron comprehensive tailing mixed base material and the copper comprehensive tailing mixed base material obtained in the step (6) into an ultra-fine powder all-in-one machine, sufficiently crushing and separating the mixed base material in the ultra-fine powder all-in-one machine through high-speed airflow, and re-coating the mineral powder particles to respectively obtain the cementing material.
The gelled materials obtained in examples 1 and 2 were tested for chemical and physical indexes, and the performance parameters are shown in the following table:
the embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (8)
1. A method for preparing a cementing material based on comprehensive tailings is characterized by comprising the following steps:
(1) primary crushing: primarily crushing tailings, spraying raw ore by using high-pressure water mist in feeding, and forming a large water curtain by using high-pressure water of a plurality of sections of water pumps to block dust leakage during primary crushing of the raw ore to obtain primary crushed ore;
(2) sorting: conveying the primary crushed ore into an intelligent automatic sorting machine for sorting;
(3) crushing in middle: respectively feeding the ores sorted out in the step (2) into a medium crusher for medium crushing to obtain medium crushed ores;
(4) grinding: feeding the crushed ore into a pulverizer to grind;
(5) grinding: carrying out two-side classification on the ore ground in the step (4) by an ultra-fine powder classifier, and finally selecting the ultra-fine powder ore;
(6) preparing materials: matching the ores of different grades sorted in the step (2) with additives in different proportions, and mixing the additives with the ultrafine powder ore obtained in the step (5) through an ultrafine powder mill to obtain a mixed base material;
(7) and (4) feeding the mixed base material obtained in the step (6) into an ultra-fine powder grinding all-in-one machine, crushing and sufficiently separating the mixed base material in the ultra-fine powder grinding all-in-one machine through high-speed airflow, and re-coating the mineral powder particles to obtain the cementing material.
2. The method for preparing the cementing material based on the comprehensive tailings in the claim 1, wherein the ores with different grades in the step (2) are comprehensive tailings with high-iron tailings and copper tailings as main components.
3. The method for preparing the cementing material based on the comprehensive tailings as claimed in claim 2, wherein the additive A matched with the comprehensive tailings is prepared by compounding alkali metal silicate, alkali metal carbonate, fly ash and limestone powder.
4. The method for preparing the cementing material based on the comprehensive tailings of claim 3, wherein the additive A comprises the following components in parts by weight: 10-20% of alkali metal silicate, 10-20% of alkali metal carbonate, 40-60% of fly ash and 10-20% of limestone powder.
5. The method for preparing the cementing material based on the comprehensive tailings of claim 2, wherein the additive B matched with the comprehensive tailings is prepared by compounding aluminum oxide, fly ash, sodium hydroxide or potassium hydroxide.
6. The method for preparing the cementing material based on the comprehensive tailings of claim 5, wherein the additive B comprises the following components in parts by weight: 10-15% of aluminum oxide, 75-80% of fly ash, 5-10% of sodium hydroxide or 5-10% of potassium hydroxide.
7. The method for preparing the cementing material based on the comprehensive tailings as claimed in claim 3, wherein the ratio of the comprehensive tailings to the additive A is 6-8: 1.
8. The method for preparing the cementing material based on the comprehensive tailings as claimed in claim 5, wherein the ratio of the comprehensive tailings to the additive B is 7-9: 1.
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